MBW973-SF6_MANUAL_E_V3.1
29
SO
2
Module
The 973 internal SO
2
module provides the user with the capability to measure SO
2
concentra-
tion in SF
6
gas compartments. The module is conveniently mounted on the back panel of the
instrument with the sample gas connections internally connected.
The module uses an electrochemical cell specifically for SO
2
. The measurement cell is designed
to provide accurate and stable results for two years in normal operation. Calibration checks can
be performed using gas standards with certified SO
2
concentration. Please contact the manufac-
turer or your local supplier for further information.
Replacement of SO
2
Measurement Cell
Back panel mounting means that the user can easily replace the measurement cell assembly.
Replacement cell assemblies are readily available and are supplied pre-adjusted for direct in-
stallation into the 973. To replace the SO
2
cell, follow the procedure:
Contact us or your local supplier to obtain a replace-
ment cell assembly.
Disconnect the 973 from gas or electrical connections
and remove the four module screws.
Pull straight back to remove the existing SO
2
meas-
urement cell assembly.
Install the replacement assembly making sure the seal-
ing O-ring remains correctly located and the pins line
up.
Replace the cover and screws.
Reconnect power and sample gas lines to continue
measurement.
Summary of Contents for 973-SF6
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